public class Substring extends SystemFunctionCall implements Callable
operationargumentEFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, INHERITED_CONTEXT, INSPECTION_CONTEXT, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, NAVIGATION_CONTEXT, NODE_VALUE_CONTEXT, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, W3C_CONSUMING, W3C_FREE_RANGING, W3C_GROUP_CONSUMING, W3C_MOTIONLESS, WATCH_METHOD| Constructor and Description |
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Substring() |
| Modifier and Type | Method and Description |
|---|---|
Sequence |
call(XPathContext context,
Sequence[] arguments)
Evaluate the expression
|
StringValue |
evaluateItem(XPathContext context)
Evaluate the function
|
ExpressionCompiler |
getExpressionCompiler()
Return the compiler of the Substring expression
|
static UnicodeString |
substring(StringValue sv,
NumericValue start)
Implement the substring function with two arguments.
|
static UnicodeString |
substring(StringValue sv,
NumericValue start,
NumericValue len,
XPathContext context)
Implement the substring function with three arguments.
|
Expression |
typeCheck(ExpressionVisitor visitor,
ExpressionVisitor.ContextItemType contextItemType)
Type-check the expression.
|
addContextDocumentArgument, addDocToPathMap, bindStaticContext, checkArguments, computeCardinality, computeSpecialProperties, copy, equalOrNull, equals, getContextNode, getConvertingCallable, getDefaultArgumentNode, getDetails, getErrorCodeForTypeErrors, getFunctionItemType, getImplementationMethod, getItemType, getOperation, getRequiredType, iterateSubExpressionInfo, makeSystemFunction, optimize, setDetails, useContextItemAsDefaultaddExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, preEvaluate, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toStringaddToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getStreamability, getStreamingAdjunct, getSystemId, getSystemId, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterate, iterateEvents, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, toPattern, toStreamingPattern, typeErrorpublic Expression typeCheck(ExpressionVisitor visitor, ExpressionVisitor.ContextItemType contextItemType) throws XPathException
typeCheck in class FunctionCallvisitor - an expression visitorcontextItemType - the static type of "." at the point where this expression is invoked.
The parameter is set to null if it is known statically that the context item will be undefined.
If the type of the context item is not known statically, the argument is set to
Type.ITEM_TYPEXPathException - if an error is discovered during this phase
(typically a type error)public StringValue evaluateItem(XPathContext context) throws XPathException
evaluateItem in class Expressioncontext - The context in which the expression is to be evaluatedXPathException - if any dynamic error occurs evaluating the
expressionpublic static UnicodeString substring(StringValue sv, NumericValue start)
sv - the string valuestart - the numeric offset (1-based) of the first character to be included in the result
(if not an integer, the XPath rules apply)public static UnicodeString substring(StringValue sv, NumericValue start, NumericValue len, XPathContext context)
sv - the string valuestart - the numeric offset (1-based) of the first character to be included in the result
(if not an integer, the XPath rules apply)len - the length of the required substring (again, XPath rules apply)context - the XPath dynamic context. Provided because some arithmetic computations require itpublic Sequence call(XPathContext context, Sequence[] arguments) throws XPathException
call in interface Callablecontext - the dynamic evaluation contextarguments - the values of the arguments, supplied as SequencesXPathException - if a dynamic error occurs during the evaluation of the expressionpublic ExpressionCompiler getExpressionCompiler()
getExpressionCompiler in class ExpressionCopyright (c) 2004-2013 Saxonica Limited. All rights reserved.